/*
 * Copyright 2010 Pierre Heinzerling, Uwe Janner, Patrick Wright
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.upp.publinksky.operations.link;

import com.upp.publinksky.dao.LinkCommentDAO;
import com.upp.publinksky.dao.LinkDAO;
import com.upp.publinksky.dto.LinkAndComments;
import com.upp.publinksky.model.Link;
import com.upp.publinksky.model.LinkComment;
import com.upp.publinksky.model.Theme;
import com.upp.publinksky.operations.util.ThemeLookup;
import com.upp.publinksky.util.JsonConversion;
import com.upp.publinksky.util.PMF;

import javax.jdo.PersistenceManager;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;


@SuppressWarnings({"unchecked"})
@Path("/link/list")
public class LinkListForTheme {
    private static final Logger log = Logger.getLogger(LinkListForTheme.class.getName());

    @PUT
    @Path("{themeId}")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public Response list(@PathParam("themeId") final int themeId) {
        // TODO: add current email to query (prevent hacking)
        log.info("getting links for theme " + themeId);
        PersistenceManager pm = PMF.get().getPersistenceManager();
        List<Link> links = new ArrayList<Link>();

        List<LinkAndComments> linkAndComments;
        try {
            Theme theme = ThemeLookup.checkedGetTheme(themeId, pm);
            List<Link> lres = LinkDAO.listLinksForTheme(theme, pm);
            for (Link ln : lres) {
                if (ln.getScore() > 0) {
                    links.add(ln);
                }
            }

            linkAndComments = new ArrayList<LinkAndComments>(links.size());
            for (Link link : links) {
                pm.retrieve(link);  // retrieve all fields
                LinkAndComments lac = new LinkAndComments(link);
                List<LinkComment> comments = LinkCommentDAO.listCommentsForLink(link, pm);
                if (comments != null) {
                    for (LinkComment lc : comments) {
                        lac.addComment(lc);
                    }
                }
                linkAndComments.add(lac);
            }
            return Response.ok(JsonConversion.toJson(linkAndComments), MediaType.APPLICATION_JSON_TYPE).build();
        } catch (Exception e) {
            log.severe(String.format("exception on retrieving links for theme: %s", e.getMessage()));
            e.printStackTrace();
            return Response.serverError().build();
        } finally {
            pm.close();
        }
    }
}